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AWD vs. 4WD - What's the difference?

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AWD vs. 4WD - What's the difference?

What Is All-Wheel Drive?

As the name implies, all-wheel-drive systems power both the front and rear wheels all the time. But in practice, there are actually two types of drivetrains that are called AWD. One does, in fact, drive all the wheels continuously, and some manufacturers refer to this as full-time AWD. The second, often called part-time AWD or automatic AWD, operates most of the time in two-wheel-drive mode, with power delivered to all four corners only when additional traction control is needed.

 

What Is Four-Wheel Drive?

This is the more traditional system that comes to mind when most people think of drivetrains that power all four of a vehicle's wheels. It isn't surprising since the principle goes back almost to the beginning of motorized transportation. The stereotypical picture of a 4WD vehicle is of a truck with high ground clearance, a shielded underbody, tow hooks and big, knobby tires. And it's true that this system is still found primarily in large trucks and SUVs.
But through the years, 4WD engineering has become increasingly sophisticated, and although it generally remains capable of more serious off-road use, it can now be found on a wider variety of comfortable, even luxurious, models. 4WD systems deliver torque through a series of front, rear and center differentials, transfer cases and couplings, which allow the vehicle to operate at maximum traction under a variety of conditions.

-Information provided by Edmunds

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